| Summary: | The radioactivity of 5813 specimens from about 25% of the ore deposits registered by Foslie in NGU nr. 126, 1925, have been measured by gamma-scintillation-counter. Anomalies have been found in specimens from about 40 localities. The studied specimens belong to the ore-collection of the Mineralogical-Geological Museum of the University in Oslo. The technics used for measuring the specimens are described, and the meaning of the results discussed. Several molybdenum and some iron deposits are found to be radioactive, and the same is the case with many copper mineralisations in Telemark. The ore deposits in Trøndelag are, however, remarkably poor in radioactive elements. The radioactivity is mostly found in the mineralized areas in Southern Norwegian rocks and in the Caledonian granits in North-Norway. Neither the pegmatites nor the alumnshales are taken into consideration. All the more important radioactive localities have been visited, but the results so far obtained have not made more expensive explorations recommendable under the present market conditions for uranium. 35970
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